Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2002-10-08
Astrophys.Space Sci. 283 (2003) 607-612
Physics
Nuclear Physics
Nuclear Experiment
6 pages, talk given at the workshop on varing fundamental constants, JENAM 2002, Porto, Portugal, September 2-7, 2002
Scientific paper
10.1023/A:1022534919165
A comparison is made of the probability of the process of two neutrino double beta decay for $^{82}$Se in direct (counter) and geochemical experiments. It is shown that the probability is systematically lower in geochemical experiments, which characterize the probability of $\beta\beta(2\nu)$ decay a few billions years ago. The experimental data for $^{130}$Te are also analyzed. It is shown that geochemical measurements on young minerals give lower values of $T_{1/2}$ ($^{130}$Te) and $T_{1/2}$ ($^{82}$Se) as compared to measurements on old minerals. It is proposed that this could be due to a change in the weak interaction constant with time. Possibilities of new, precise measurements be performed with the aid of counters and geochemical experiments are discussed.
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